Loose Tenon? Make a mortise in both pieces and make a tenon to fit the two holes? The tenon can be glued to one or both pieces. Biscuits, dowels, dominoes are all loose tenons. You can make more or less loose tenons depending on the pieces being joined. Drawboring would be a variation of a loose tenon as well. A tenon or peg with the grain running the full length of the tenon is a stronger tenon and relatively easy to make.